| /******************************************************************************* |
| * Copyright (c) 2018 Ericsson |
| * |
| * All rights reserved. This program and the accompanying materials are |
| * made available under the terms of the Eclipse Public License v1.0 which |
| * accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| *******************************************************************************/ |
| package org.eclipse.tracecompass.internal.provisional.tmf.core.model.filter.parser; |
| |
| import java.util.Map; |
| import java.util.Queue; |
| import java.util.function.Predicate; |
| |
| /** |
| * This class implement a filter expression that could be tested against an |
| * input |
| * |
| * @author Jean-Christian Kouame |
| * |
| */ |
| public class FilterExpression implements Predicate<Map<String, String>> { |
| |
| private final Queue<Object> fElements; |
| |
| /** |
| * Constructor |
| * |
| * @param elements |
| * The list of element representing this experession |
| * |
| */ |
| public FilterExpression(Queue<Object> elements) { |
| fElements = elements; |
| } |
| |
| @Override |
| public boolean test(Map<String, String> data) { |
| |
| if (fElements.isEmpty()) { |
| return false; |
| } |
| |
| int index = 0; |
| boolean result = false; |
| String operator = IFilterStrings.OR; |
| while (!fElements.isEmpty()) { |
| Object element = fElements.poll(); |
| |
| if (index % 2 == 0) { |
| if (element instanceof FilterSimpleExpression) { |
| FilterSimpleExpression expression = (FilterSimpleExpression) element; |
| result = handleOperator(result, operator, expression.test(data)); |
| } else if (element instanceof FilterExpression) { |
| FilterExpression expression = (FilterExpression) element; |
| result = handleOperator(result, operator, expression.test(data)); |
| } else { |
| return false; |
| } |
| } else { |
| if (!(element instanceof String)) { |
| return false; |
| } |
| operator = (String) element; |
| } |
| index++; |
| } |
| return result; |
| } |
| |
| private static boolean handleOperator(boolean left, String operator, boolean right) { |
| return operator.equals(IFilterStrings.OR) ? (left || right) : (left && right); |
| } |
| } |